I understand the importance of not installing a boiler that is too large or too small. Does the too large rule change when the boiler in question is a combi.
Boiler size calculation
- Thread starter JK
- Start date
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usually you size a combi on your hot water req
most of them now are modulating or can be range rated
most of them now are modulating or can be range rated
kevplumb said:usually you size a combi on your hot water req
most of them now are modulating or can be range rated
thanks, kev; I should have mentioned that the boiler was oil. Unfortunately oil is on or off, I was concerned about the value or saving of a condensing unit being over rated to give plenty of hot water and wheather or not it would condense while not being pushed to heat. Apparently, I have found since my post, that the Grant uses two pumps, one for heating and one for water.
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